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Kx 500 help

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troy_68:
I recently rebuilt my 1996 kx500 and it runs good but it seams to be slow. it has 190 lbs of compression i run 93 octane gas. and i am barley able to pull away from my buddys kx 250. i also have a fmf exhaust system and uni air filter. any help would be much appreciated.
Troy

jonny500:
blocked exhaust or power valve operation/timing. a couple of things to look at

kwakman:
jetting and/or ignition if compression is good.also, carb blockages, dirty air filter, fuel flow valve height are some others.K.

Friar-Tuck:
Welcome Troy,
Thanks for signing up to the site, now lets see..
  Unless your cousin only weighs 80lbs and has or has an ex-pro's 250 something does sound suspicious...  If the engine is running o.k., move the Kips plastic /rubber cover out of the way and see if the rod and lever are moving when you rev the bike.
  You should be able to see the rod moving as the engine rpm increases. 
  Tuck\o/

husky333:
occasionaly the circlip comes adrift on the powervalve actuating arm, this disengages the powervalves. Its a simple fix, look behind the rubber cover on the outside of the barrel behind the front pipe. :wink:

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